Disk cam for gill-drawing frames.



W. HOLDSWORTH. DISK CAM FOR GILL DRAWING FRAMES. APPLICATION FILED DBO. 29, 1913.

1, 1 1 3,346. Patented Oct. 1 3, 1914.

Swm m UNITED STATES PATENT OFFICE.

WILLIE HOLDSWORTH, 0F NORTHBORO,MASSACHUSETTS, ASSIGNOR 0F ONE-I-IALF TO HARRY SMITH, OF NORiTI-IBORO, MASSACHUSETTS.

DISK CAM FOR GILL-DRAWING FRAMES.

To all whom it may concern Be it known that T, WILLIE HoLDswonTH, a subject of the King of Great Britain, residing at Northboro, in the county of \Vorcester and State of Massachusetts, have invented a new and useful Disk Cam for Gill-Drawing Frames, of which the following-is a specification.

This invention is an improvement over the invention shown in the patent to lVilliam l-Ioldsworth, No. 722,984, patented March 7, 1903, on gill-drawing frame.

The principal object of this invention is to provide a simple construction which, without increasing the cost of the disk cam and its connected parts, will result in a great saving'of time and permit ofthe running of the frame at a very. high speed.

Reference is to be had to the accompanying drawings in which Figure 1 is a side elevation of the bottom screw shaft of a drawing frame constructed in accordance with this invention and showing the cam removed therefrom and in position to be applied thereto; Fig.2 is a simi-' lar view showing the same in position; and Fig. 3 is a sectional view on the line 8-3 of Fig. 2.

Prior to the invention of the said VVilliam Holdsworth, the cams for this lower shaft were made in separate pieces, each one being driven into place on the shaft independently. When a new cam had to be applied, it was necessary practically to dismantle the machine and it required considerable skill and several hours of time to get a new cam into proper position on the shaft. The gears also had to be put back in exactly the right position. Moreover, the speed of operation could not be increased beyond a certain limit. Even after said invention of William Holdsworth it still required a great deal of time to putthe new cams in position for the reason that the shaft had to be taken out of the machine and the gear and other removable part-s taken ofi from the end on which the,

gear is located to permit of the sliding of the collar with its cams over the shaft from that end. I have discovered that a great increase in speed can be secured in operation and that a very material saving in time in making these repairs can be obtained by standardizing these shafts and cam collars. and at the same time arranging, the parts Application filed December 29, 1913.

Specification of Letters Patent.

Serial No. 809,219.

the gears are located. In this way thedelay incident to the taking off of the gearsyand putting them back on in the right place is eliminated although the shaft itself has to be taken out of the bearings.

.. The operation of replacing the cams by this invention is almost instantaneous and there is no possibility of getting them onnin the wrong place, no adjustments to be made, and no need of skilled workmanship- In this way production is increased material percentage.

sidering them particularly in connection with the said patent to 'Holdsworth, No.

7 22,984, it will be seen that the bottom screw shaft 1 is provided with its gear 2, in the usualway and thata pair. of collars 8 integral with the shaft arelocated onthe opposite sides of the bearing next to the gear.

On this shaft also is a hub i-of a diameter at least as great as the diameter of the screw 5. At the end of this hub opposite this screw there is a fixed collar 6 andon the hub is a fixed key 7.

so that when it is necessary to replace a cam it can be done by sliding it over the endof the shaft opposite to that on which by a very Referring now to the drawings and con- Patented Oct. 13,1914.

Theremovable'cam consists of a circular plate or disk 10 on the face of which are fixed a pair of cams 11 in the present instance, although it will be understood that the sanie principle is applicable when only a single cam is employed. These cams, as will be understood from reference to the above mentioned patent, are for raising the fallers or gill bars from the bottom screw into the top screw, not shown. The form of these cams may be substantially the same as those shown in the Holdworth patent but I have shown them hereinof simpler shape. These cams are spaced from the flat side of the plate 10 and are made integral with it in the manufacture of this piece. The plate 10 is provided with a hub 12at the back and the combined thickness of the plate and hub I is substantially the same as the width of the is adapted to enter a depression in the hub. As there is only one of these depressions it will be obvious that if the cam is put on wrong side around, the set screw cannot be screwed in so as to come flush with the surface of the hub 12 and the workman will know that he has got it on wrong.

The operation of the machine itself is the same as is the operation of the machine shown in said Holdsworth patent. But when it is necessary to replace the disk cam practically all the labor heretofore required is eliminated and all that has to be done is to take off the tops of the boxes in which the shaft rotates, lift the shaft slightly, unscrew the set screw 14 which holds the disk cam on the hub 4 and slide the cam off to the left as shown in the figures of these drawings. Then the new cam is placed on in the same way, its set screw tightened and the shaft set back into the bearings.

In the manufacture of these devices all the keys 7 are put in the same place on the shaftsand all the key-ways 13 are put in the same place on the disk cams, consequently, any cam will fit any shaft and all also come in exactly the right place when put on the shaft in the only position in which it will fit. It will be seen therefore that not only is the amount of work and time required in placing the cams reduced to a minimum but the most ignorant operator cannot put them on in the wrong place and cannot cause any breakage or damage by even a slight misplacement of the parts. This is an extremely important advantage in this industry because each machine is speeded up to a great speed and the stoppage of a machine for a considerable period of time results in great loss of production.

Although I have illustrated and described only a single form of cam and a single type of gill-drawing frame shaft I am aware of the fact that the invention is capable of application to other types of these devices withoutdeparting from the scope of the invention as expressed in the claims, therefore, I do not wish to be limited in these respects but lVhat I do claim is 1. The combination with the bottom screw shaft for a gill-drawing frame, of a disk cam therefor, constructed to be moved into and out of position over the screw portion of said shaft and means whereby the disk cam can be placed in only one position on said screw shaft.

2. In a gill-drawing frame, the combination with a bottom screw shaft, of a hub thereon at the end of the screw, said hub being of a diameter as great as the diameter of the screw, and a disk cam fitting said hub and movable on the hub over the screw.

3. In a gill drawing frame, the combination with the bottom screw shaft having a hub thereon at the end of the screw thereof, of a diameter as great as the diameter of the screw and provided with a collar at the end of the hub opposite the screw, and with a fixed key, and a cam having a passage therethrough with a key-way therein fitting said hub and adapted to be moved over the screw on said hub, and a set screw for fixing said cam in a single position on said hub.

In testimony whereof I have hereunto set my hand, in the presence of two subscribing witnesses.

WVILLIE HOLD SWVORTH.

\Vitnesses HARRY SMITH, QFonnnsr W ESSON.

by addressing the Commissioner of Patents,

Washington, D. 0. 

